Compressor Map For 4/71 and 6/71 Roots

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BDS info states that a 4-71 on a 231ci engine OverDriven 20% will make 18 PSI
That is the max limit for their 4-71 blower.
BDS 6-71 on a 289ci engine at 1:1 drive ratio produces 21PSI

These are rough estimates. So if you run a 6-71 at 5% UnderDrive on a 225ci engine, you will be around your 20PSI goal.

The PSI for the Roots blowers are controlled by the throttle position.
Mash the gas pedal from idle and see an instant 20PSI, Roots boost is linear. 20PSI at any RPM.

Several centrifugal maps show the "island" being between 60 and 70% adiabatic efficiency. With a wide range of HP to drive the blower 20 to 40 HP.
The 6-71 will eat at least 75HP and have less than 50% adiabatic efficiency.
 
MiradaMegaCab said:
BDS info states that a 4-71 on a 231ci engine OverDriven 20% will make 18 PSI
That is the max limit for their 4-71 blower.
BDS 6-71 on a 289ci engine at 1:1 drive ratio produces 21PSI

These are rough estimates. So if you run a 6-71 at 5% UnderDrive on a 225ci engine, you will be around your 20PSI goal.

The PSI for the Roots blowers are controlled by the throttle position.
Mash the gas pedal from idle and see an instant 20PSI, Roots boost is linear. 20PSI at any RPM.

Several centrifugal maps show the "island" being between 60 and 70% adiabatic efficiency. With a wide range of HP to drive the blower 20 to 40 HP.
The 6-71 will eat at least 75HP and have less than 50% adiabatic efficiency.
Click to expand...

i spent 4 hrs last night on dyers, the blower shop, bds, and littlefield and couldn't find any of that! grr, but thanks. i figure the 6/71 will move so much volume i wont have to have the pressure up to make my power goal, as well as keeping the rpm down (heat) so i think the best thing i can do is to get a case and see where it fits!

i kinda though there would be more windowed and broken cases but i havn't found one for cheap. good for mock up and such...
 
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